USB memory stick



FIG. 1 is an upper perspective view of our design for a USB memory stick;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof; and,

FIG. 6 is a front elevation view thereof, the rear view being a mirror image thereof. 

The ornamental design for a USB memory stick, as shown and described. 